Mechanics

CHEVROLET SILVERADO DISTRIBUTOR PROBLEM

1991 Chevrolet Silverado • 23,500 miles

Timing seems off. Lots off spark knock using 87 octane. Turned distributor once before and seemed to help. Can't remember which way to turn once it's loose. Help me please.
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Guest
December 23, 2012.



If you rotate it counterclockwise, it will advance the timing but make the pinging worse. The other way will retard the timing getting rid of the noise.

Have you checked the egr valve? You make have to do a top engine cleaning for the pinging

Roy

ASEMaster6371
Dec 23, 2012.